package com.example.demo.common;

import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.SneakyThrows;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

import java.util.HashMap;

/**
 * 统一返回数据格式
 */

@ControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice {

    //这里改为springmvc内部已经注册好的mapper, 如要配置日期格式,就可以在application.yml文件里边配置了
    @Autowired
    private ObjectMapper objectMapper;
    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {
        return true;
    }

    @SneakyThrows
    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        if(body instanceof HashMap){
            return body;
        }
        if(body instanceof String){
            return objectMapper.writeValueAsString(AjaxResult.success("成功",body));

        }
        return AjaxResult.success("成功",body);
    }
}
